Global Volcanism Program | Image GVP-02423
Ash plumes and incandescent lava fragments are ejected from a new scoria cone in 1975. Following minor ash eruptions from the Plosky Tolbachik summit crater on 28 June, the "Great Tolbachik Fissure Eruption" began 18 km S of the summit on 6 July, producing a major eruption that lasted until 15 September. A dominantly effusive eruption began 28 km S of the summit on 18 September and continued until December 1976.
Photo by Yuri Doubik, 1975 (Institute of Volcanology, Petropavlovsk).